摘要:

As the title implies, this two-part series will be devoted entirely to the economic aspects of instrument evaluation (Part 1) and acquisition (Part 2). The essential elements dealing with the economics of instrument testing are outlined in Table 1. A knowledge of comparative testing costs between the present technology utilized in the laboratory and that introduced via new instrumentation is as vital to management in its decision-making process as the instrument's accuracy, precision, and observed effects on diagnostic testing. In situations where the technical data derived from instrument evalutions are essentially equivalent, the fine balance between making an acquisition or not wil undoubtedly be influenced strictly by economics, especially if savings in operational can be realized.

ISSN:1073-9149    

DOI:10.1080/10739147908543475

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

A gas-phase reactor, consisting of a reaction tube with nine gas reagent injection jets placed axially along its length, has been connected to the ion source of a time-of-flight mass spectrometer. Provision has been made for purifying, and mixing several gases and exciting this mixture by microwave discharge prior to entry into the reaction tube. The mass spectrometer has been interfaced to a dedicated mini-computer system which is capable of simultaneous monitoring of five different masses and on-line control of the setting of one of these mass values. Performance of the system is illustrated by observation of the titration of active nitrogen with nitric oxide.

ISSN:1073-9149    

DOI:10.1080/10739147908543476

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

A versatile automatic controller designed for unattended operation of a variety of electrochemical equipment is described. The instrument offers automatic control of two voltage sources and a potentiostat, as well as ancillary functions such as electrode conditioning, stirrer operation, solution purging and recorder offset and pen operation. No modification of existing Princeton Applied Research equipment is required. The controller has been used for polarography and a number of voltammetric techniques including anodic and cathodic stripping, cyclic volt-ammetry and potentiometric stripping analysis. Instrument design, operational sequences and interfacing to peripheral equipment are described. Instrument performance is evaluated in terms of an anodic stripping voltammetric method for the analysis of Se(IV) and Te(IV) with a thin gold film electrode.

ISSN:1073-9149    

DOI:10.1080/10739147908543477

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

A recording titrimeter for use with luminescent endpoint detection is described. The titrimeter consists of a low-cost photomultiplier tube, regulated high voltage supply, electrometer, chart recorder, and peristaltic pump. A reaction cell based upon a 10 mm pathlength spectrophotometer cuvet and suitable for luminescence detection at high ambient light level is also described. The precision attainable with the titration system was determined with an acid-base titration using a modified reaction cell suitable for photometric titrations. A procedure suitable for determining Ca+2in the presence of at least five-fold Mg+2at the nanomole level is described, using the luminol-hydrogen peroxide reaction as the endpoint indicator. Ions which form stable complexes with the EGTA reagent and materials which significantly react with the Cu(II) back-titrant interfere with the determination.

ISSN:1073-9149    

DOI:10.1080/10739147908543478

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

A versatile manually-operated function generator that can be used in electrochemical applications is described. The instrument combines a 16 bit digital to analog converter (DAC) with digital control of the switching, is completely self-contained, and requires no external measurements to set waveform potential limits or scan rates. Waveforms generated by the instrument include ramp and hold, sawtooth, and triangular (both symmetrical and asymmetrical).

ISSN:1073-9149    

DOI:10.1080/10739147908543479

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

ISSN:1073-9149    

DOI:10.1080/10739147908543480

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

ISSN:1073-9149    

DOI:10.1080/10739147908543474

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor